a = '100'
arr = [1, 2, 3]
def test1():
    global a
    print('-' * 32)
    print('test1: a=', a)
    print(arr)
    a = '200'
    arr.extend([4, 5, 6])
    print('test1: a=', a)
    print(arr)

test1()
print(a)
print(arr)
